Quelles sont les relations génétiques entre des caractères mesurés sur des animaux purs ou croisés issus de Piétrain ?

Larzul et al., 48es Journées de la Recherche Porcine (FRA), 2-3 février 2016, Paris, p. 287-288, poster

Poster.

FR

La sélection des populations porcines françaises se fait en mesurant des animaux de race pure, en ferme ou en station de contrôle. Cependant, l’un des objectifs de la sélection est d’améliorer la performance des animaux croisés. L’estimation des corrélations génétiques entre ces performances permet d’évaluer l’efficacité de la sélection sur des caractères déjà sélectionnés ou potentiellement à sélectionner dans l’avenir pour améliorer la qualité des produits ou le bien-être des animaux.

ENG

What are the genetic relationships between traits measured either on purebred or crossbred Piétrain pigs ?

In pig breeding schemes, the traits of interest are measured in the grandparent or parent populations on purebred animals. However, the progress in these pure breeds should be expressed in the crossbred offspring. It is generally expected that the genetic relationships between traits measured on purebred and crossbred animals are high for growth traits and body composition. The purpose of the study was to estimate the genetic correlations between performances recorded in pure and crossed animals on a large number of traits related to production, quality, welfare and health, i.e. growth rate, carcass composition, meat quality including boar taint, sex hormones, blood parameters, bodily injury and leg weakness. About 1,600 animals were included in the study, either purebred Piétrain or crossbred Piétrain x Large White. For the majority of production traits such as growth and carcass composition, genetic correlations between purebred and crossbred were close to 1 (between 0.7 and 1, with a standard error between 0.05 and 0.20). Some traits had lower correlation parameters such as the number of leukocytes (rg = 0.5 ± 0.30) or the number of injuries at the beginning of fattening (rg = -0.14 ± 0.40).